Illuminating disorder: Many highly efficient light emitters are members of the family β-NaLnF4 (Ln=Y, La–Lu). Diffuse X-ray scattering is combined with single-crystal absorption spectroscopy at cryogenic temperatures to unambiguously identify and characterize two crystallographically inequivalent spectroscopic sites (A and B). The high light yield is correlated with the existence and nature of these sites.
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Aebischer et al. (2006) studied this question.
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